Performance evaluation of MIMO-OFDM with signal space diversity over frequency selective channels

Vertical Bell labs layered space-time (V-BLAST) is known to provide a good tradeoff between performance and complexity for multiple antenna systems. In this paper, an improved scheme which utilizes signal space diversity is proposed for multiple-input multiple-output (MIMO) bit interleaved coded modulation (BICM). The signal space diversity (SSD) has the advantage to increase the diversity order without the expansion of extra bandwidth and power by means of rotating the modulated symbols and interleaving the in-phase and quadrature components separately. BICM combined with the SSD would further enhance the diversity gains. Simulation results show that the proposed scheme is superior to V-BLAST, regardless of the number of antennas and modulation order.